DS3231M MEMS Precise RTC Evaluation Board DFRobot DS3231M MEMS Precise RTC Evaluation Board (DFR0641) is designed to evaluate DS3231M RTC. This board includes DS3231M MEMS Precise RTC and 2.54-7P pin. The DS3231M chip integrates MEMS resonator and temperature compensator. This RTC can be powered by a coin cell battery and can still maintain accurate timing even if the mains are disconnected. The DS3231M chip provides information about seconds, minutes, hours, days, months, and years. This clock can automatically adjust the end date of the month and the leap year correction.